Buggy code:
protected void init ( ) { } protected void setDeferNodeExpansion ( boolean deferNodeExpansion ) throws SAXNotRecognizedException , SAXNotSupportedException { } protected boolean getDeferNodeExpansion ( ) throws SAXNotRecognizedException , SAXNotSupportedException { } protected void setCreateEntityReferenceNodes ( boolean create ) throws SAXNotRecognizedException , SAXNotSupportedException { } public boolean getCreateEntityReferenceNodes ( ) throws SAXNotRecognizedException , SAXNotSupportedException { } public void setIncludeIgnorableWhitespace ( boolean include ) throws SAXNotRecognizedException , SAXNotSupportedException { } public boolean getIncludeIgnorableWhitespace ( ) throws SAXNotRecognizedException , SAXNotSupportedException { } protected void setDocumentClassName ( String documentClassName ) throws SAXNotRecognizedException , SAXNotSupportedException { } protected String getDocumentClassName ( ) throws SAXNotRecognizedException , SAXNotSupportedException { } protected Element getCurrentElementNode ( ) throws SAXNotRecognizedException , SAXNotSupportedException { } public void setFeature ( String featureId , boolean state ) throws SAXNotRecognizedException , SAXNotSupportedException { } public boolean getFeature ( String featureId ) throws SAXNotRecognizedException , SAXNotSupportedException { } public void setProperty ( String propertyId , Object value ) throws SAXNotRecognizedException , SAXNotSupportedException { } public Object getProperty ( String propertyId ) throws SAXNotRecognizedException , SAXNotSupportedException { } public void startDocument ( ) { } public void endDocument ( ) throws Exception { } public void xmlDecl ( int versionIndex , int encodingIndex , int standaloneIndex ) throws Exception { } public void textDecl ( int versionIndex , int encodingIndex ) throws Exception { } public void startNamespaceDeclScope ( int prefix , int uri ) throws Exception { } public void endNamespaceDeclScope ( int prefix ) throws Exception { } public void startElement ( QName elementQName , XMLAttrList xmlAttrList , int attrListIndex ) throws Exception { } public void endElement ( QName elementQName ) throws Exception { } public void characters ( int dataIndex ) throws Exception { } public void ignorableWhitespace ( int dataIndex ) throws Exception { } public void processingInstruction ( int targetIndex , int dataIndex ) throws Exception { } public void comment ( int dataIndex ) throws Exception { } public void characters ( char [ ] ch , int start , int length ) throws Exception { } public void ignorableWhitespace ( char [ ] ch , int start , int length ) throws Exception { } public void startCDATA ( ) throws Exception { } public void endCDATA ( ) throws Exception { } public void startEntityReference ( int entityName , int entityType , int entityContext ) throws Exception { } public void endEntityReference ( int entityName , int entityType , int entityContext ) throws Exception { } public void startDTD ( QName rootElement , int publicId , int systemId ) throws Exception { } public void internalSubset ( int internalSubset ) { } public void endDTD ( ) throws Exception { } public void elementDecl ( QName elementDecl , int contentSpecType , int contentSpecIndex , XMLContentSpec . Provider contentSpecProvider ) throws Exception { } public void attlistDecl ( QName elementDecl , QName attributeDecl , int attType , boolean attList , String enumString , int attDefaultType , int attDefaultValue ) throws Exception { } public void internalPEDecl ( int entityNameIndex , int entityValueIndex ) throws Exception { if ( ( fDeferredDocumentImpl ) != null ) { if ( fGrammarAccess ) { StringBuffer str = new StringBuffer ( ) ; str . append ( "<!ENTITY<seq2seq4repair_space>%<seq2seq4repair_space>" ) ; str . append ( fStringPool . toString ( entityNameIndex ) ) ; str . append ( "<seq2seq4repair_space>\"" ) ; str . append ( fStringPool . toString ( entityValueIndex ) ) ; str . append ( "\">" ) ; int commentIndex = fStringPool . addString ( str . toString ( ) ) ; int internalPEEntityIndex = fDeferredDocumentImpl . createComment ( commentIndex ) ; int schemaIndex = getFirstChildElement ( fDocumentTypeIndex , "schema" ) ; fDeferredDocumentImpl . appendChild ( schemaIndex , internalPEEntityIndex ) ; } } else if ( ( fDocumentImpl ) != null ) { if ( fGrammarAccess ) { StringBuffer str = new StringBuffer ( ) ; str . append ( "<!ENTITY<seq2seq4repair_space>%<seq2seq4repair_space>" ) ; str . append ( fStringPool . toString ( entityNameIndex ) ) ; str . append ( "<seq2seq4repair_space>\"" ) ; <START_BUG> str . append ( fStringPool . orphanString ( entityValueIndex ) ) ; <END_BUG> str . append ( "\">" ) ; Node internalPEEntity = fDocumentImpl . createComment ( str . toString ( ) ) ; Node schema = XUtil . getFirstChildElement ( fDocumentType , "schema" ) ; schema . appendChild ( internalPEEntity ) ; } } else { fStringPool . orphanString ( entityValueIndex ) ; } } public void externalPEDecl ( int entityNameIndex , int publicIdIndex , int systemIdIndex ) throws Exception { } public void internalEntityDecl ( int entityNameIndex , int entityValueIndex ) throws Exception { } public void externalEntityDecl ( int entityNameIndex , int publicIdIndex , int systemIdIndex ) throws Exception { } public void unparsedEntityDecl ( int entityNameIndex , int publicIdIndex , int systemIdIndex , int notationNameIndex ) throws Exception { } public void notationDecl ( int notationNameIndex , int publicIdIndex , int systemIdIndex ) throws Exception { } private int getFirstChildElement ( int nodeIndex ) { } private int getFirstChildElement ( int nodeIndex , String name ) { } private int getLastChildElement ( int nodeIndex ) { } private int getPrevSiblingElement ( int nodeIndex ) { } private int getLastChildElement ( int nodeIndex , String elementName ) { } private int getPrevSiblingElement ( int nodeIndex , String elementName ) { } private int getLastChildElement ( int nodeIndex , String elemName , String attrName , String attrValue ) { } private int getPrevSiblingElement ( int nodeIndex , String elemName , String attrName , String attrValue ) { } private void copyInto ( Node src , int destIndex ) throws Exception { } private void setOccurrenceCount ( Element model , int minOccur , int maxOccur ) { } private Element createChildren ( XMLContentSpec . Provider provider , int index , XMLContentSpec node , DocumentImpl factory , Element parent ) throws Exception { } private int createChildren ( XMLContentSpec . Provider provider , int index , XMLContentSpec node , DeferredDocumentImpl factory , int parent ) throws Exception { } }

Fix:
str . append ( fStringPool . toString ( entityValueIndex ) ) ;